High-potential insulator.



No. 836,122. PATENTED "NGV, E, M06, E. M. LOGKE.

HIGH OTENTIAL INSULATGR.

APPLICATION FILED MAR.23,1903.

WIT/VE' S SE S,

To v1r/ZZ whom it may concern."

FRED M LooKEQ or vieron, NEW roEKl HleH-PQTENi'IAL'iNsuLATon.

no. 836,122.l

`Be it known that 1,' FRED M. Looms, oi Victor, in the county ofOntario, in the State of New York, have invented new and usefulImprovements in High-Potential Insulators, of which the following, takenin connection With the accompanying drawings, is a full, clear, andexactdescription. y

This invention relates to improvements in high potential insulators andfastening means therefor, and refers more particularly to that class inwhich a center insulatingsleeve is held to the cross-arm by aclampingbolt anchored within the sleeve and clamped to the cross-arm.

The primary object of this invention is to anchor the head of the boltwholly within the body of the sleeve tor the purpose of' increasing thearcing-space between the bolt and the electric conductor, which may besecured to the insulator. These insulators are adapt- -ed to support theconductors for high-voltage electric currents; and my object, therefore,is not onlyto guard against the punctural'iility of the insulators, butalso to prevent the leakage of part of the current to the cross-arm oranchoring-bolt.

In the drawings, Figure 1 is a transverse vertical sectional view of aninsulator, a cross-arm, and a clamping-bolt for securing the insulatorto the cross-arm. Fig. 2 is a transverse vertical sectional view lof aslightly-modified form of insulator and tastening means therefor.

Similar reference characters indicate corresponding parts in both views.

In carrying out the objects of this invention I have shown a porcelaininsulator composed ot an inner hollow center piece or sleeve 1 andanouter bell-shape section 2, the inner section being mounted upon across-arm and is provided with. a lengthwise yaperturet for receiving aclampingbolt 5.

The aperture 4 of thersleeve 1 is enlarged at its upper end for forminga socket 6 and a shoulder 7, the socket 6 opening from the outer end ofthe sleeve 1 and extending inwardly a considerable distance from saidouter end, so as to form a considerable arcing-space between theconductor and bolt 5.

The clamping-bolt is arranged in the aperture 4, and its outer end isprovided with a head 8, which engages the shoulder 7 at the base of thesocket 6, while the other end of l Speccaton of Letters Patent.

- v l Applicata@ tied March 23. 190e. 4serai No. 149,124.

Athe cross-arm and is threaded `Patented. No'v. 2o, 190e.

the bolt 5 is passed through an aperture Qin for receiving aclan'iping-nut 10,` engaging the opposite face of the cross-arm, wherebywhen thev nut is screwedy in one direction the insulatingsleeve 1 isdrawn into .engagement with the cross-'arm andheld fromendwise orlateraly movement. i .l

In Fig. 2 I have shown an insulator composed ot an inner sleeve 1 and anouter section 2', the inner sleeve resting upon a crossarm 3 and isprovided with a lengthwisetapering opening 4-, which gradually increasesin diameter from its inner end adjacentto the cross-arm toward the outerend for receiving a tapering clamping-bolt 5', which also increases indiameter from its inner end adjacent the cross-'arm outwardly for thepurpose of forming an enlarged head to hold the insulator-sleeve 1 whenthe bolt is clamped to the cross-arm 3.

The outer end or head of the bolt terminates a considerable distancewithin the outer end of the sleeve 1, so as to remove it as far aspossible from the conductor, (not shown,) and thereby prevent the arcingof the current from the conductor to said bolt or shaft.

The outer tapering end of the bolt or shaft 5 within the socket 4 issurrounded by a suitable cement or filling 11, which serves to securethe adjacent parts together, while the lower end of the bolt or shaftextends through an aperture 9 in the cross-arm 3 and is threaded toreceive a clamping-nut 10, whereby the bolt or shaft is drawn endwise,and thereby clamps the insulator-sleeve 1 firmly upon the cross-arm.

The center piece (shown in Figs. 1 and 2) is also bell shape, exceptthat the center-bolt opening extends entirely therethrough from top tobottom, so that the exterior diameter of the lower end of this centerpiece is greater than that of its upper end, while the interiordiameter'of the upper end is greater than that of its lower end, and inboth instances the upper end of the bolt terminates some distance belowthe upper end of the center piece Vfor the purpose of establishing anarcing-space between the head of the bolt and the conductor, which maybeattached to the outer' sleeve, as 2 or 2. l,

The obj ect oi' flaring the bases oi the insulator-sections outwardly'from top to bottom is to neutralize as far as possible the static inpositionI ICO injurious effects upon the oross-arin or insulator-pin andalso to prevent short circuits between the conductor and fastening-bolt'for tne insulator.

It is now a parent that the lower portions of each-of tile bolt-openings4 and 4 are smaller than their upper portions `and that the upper endofthe bolt is larger than the lower end of the opening through which itpasses, while the diameter oi the upper end of the bolt-opening is equalto or greater than the upper Aend of the bolt, so that the head of thelbolt is sunk some distance beneath the upper end of the center piece,but is prevented. from being drawn through the lower end of thebolt-opening.

Having thus described Inv invention, what l. claim, and desire to secureby Letters Patent, is

A high-potential insulator having a center piece of porcelain formedwith a central tapering opening which is smaller at the bottom than at'the top, in combination with a tapering bolt in the opening and havingits upper end smaller than the upper end, but larger -than the lower endof said opening, whereby the ,bolt is removable from one end only of theopening and wedges in the .opposite end.

In witness whereof l have hereunto set iny hand this 5th day of March,1903.

FRED M. LOCKEv Witnesses:

MILDRED M. Nori, HOWARD P. DENIsoN.

